StrangerVille is the only pack I paid full price for, purchased immediately and thoroughly enjoy it. I took my time playing it. If you get it, I recommend playing it with a sim in the military and then playing it with a sim that is infected, or you can use the pre-made Sim that is in the military and infected.
Don't rush through solving it. When I first played I had a Sim with a farm on the plateau and it did really well before I solved the mystery. The weather was great for growing it. I did a rags to riches theme and he went from $500 to a few hundred thousand simoleans really quickly with the farm before I had him join the military and solve the mystery.
I actually had a save where I intentionally left the weather strange and infected Sims in other towns because I find it hilarious to watch that midnight full on run.
You will have to redo the bar and library and a few other houses as they are just plain hideous. But keep a bar and a library because they are germane to the story. I have two lots, Slip 45 Cafe (it is a working restaurant, I replaced the trailer lot, but it looks like a trailer) and StrangerVille Motel (this motel another sim created and I remodeled the first floor of it and made it a lounge with a spa but it looks like it is a working motel) that fits perfectly where the trailer park is and that adjacent lot.
So, I really like the town, it is pretty and it is one of the largest in terms of the number of lots you can build on or replace existing lots. Also, it adds the military career and you can plant bugs on all types of sims and use it outside of the mystery. So, yeah I love this GP.
I don't have ROM, but the world looks interesting if that is your thing